A ribozyme is

a section of the DNA that is expressed in the mRNA

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a self-splicing intron that acts like an enzyme

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a complex made up of many ribosomes replicating the same strand of mRNA

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one of the small ribosomal subunits

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Solution

The correct option is B a self-splicing intron that acts like an enzyme
A ribozyme is an RNA (Ribonucleic acid) enzyme that catalyzes the reaction. They catalyze reaction the same way as protein enzymes and are called as proteolytic enzymes. They were found to catalyze there own self under specific laboratory conditions. They help in the process of splicing.
So, the correct option is 'A self-splicing intron that acts as an enzyme'.

Suggest Corrections

	Column I		Column II
a.	Binding of mRNA to smaller ribosomal subunit	(i)	$I F_{1}$ and $e I F_{4}$
b.	Binding of mRNA to larger ribosomal subunit	(ii)	$I F_{3}$ and $e I F_{2}$
c.	Codon anticodon interaction	(iii)	$E - F G$ and $e E F_{2}$
d.	Translocation	(iv)	$I F_{2}$ and $e I F_{3}$